A stroke is a medical emergency that occurs when blood flow to part of the brain is interrupted or when a blood vessel in the brain ruptures. Every minute during a stroke, millions of brain cells can be damaged, making rapid recognition and treatment critical.

What many people don’t realize is that, in some cases, the body may provide an early warning before a major stroke occurs. One of the most important warning signs is a transient ischemic attack (TIA), often called a “mini-stroke.”

Although the symptoms of a TIA usually disappear within minutes or hours, they should never be ignored. A TIA is a medical emergency because it can be a warning that a full stroke may occur in the days, weeks, or months ahead. Recognizing the signs and seeking immediate medical care may help reduce the risk of a future stroke.

Here’s what you need to know.

What Is a Transient Ischemic Attack (TIA)?

A transient ischemic attack occurs when blood flow to part of the brain is temporarily blocked.

Unlike a major stroke, the blockage resolves before permanent brain damage occurs, so symptoms usually disappear completely within 24 hours—often much sooner.

However, a TIA is not harmless.

It is often a sign that the blood vessels supplying the brain are affected by an underlying problem, such as narrowing from plaque buildup or a blood clot.

Studies have shown that people who experience a TIA have a significantly increased risk of having a stroke, particularly within the first few days after the event.

Common Warning Signs of a TIA or Stroke

The symptoms of a TIA are nearly identical to those of a stroke.

They may include:

Sudden weakness or numbness

Especially affecting:

• One side of the face
• One arm
• One leg

A person may suddenly have difficulty lifting one arm or notice facial drooping.

Difficulty speaking

Speech may become:

• Slurred
• Confused
• Difficult to understand

Some people suddenly cannot find the right words or have trouble understanding others.

Sudden vision changes

Vision problems may include:

• Blurred vision
• Double vision
• Loss of vision in one eye
• Loss of part of the visual field

These symptoms may last only a few minutes but still require emergency evaluation.

Loss of balance or coordination

A TIA may cause sudden:

• Dizziness
• Difficulty walking
• Poor coordination
• Loss of balance

These symptoms can increase the risk of falls.

Sudden severe headache